From e2c15f3f2fb6a67d615322020a78bf334621b16c Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 19 Jan 2025 22:35:49 +0100
Subject: feat(engine): add orthographic projection support

---
 engine/src/renderer/opengl.rs | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

(limited to 'engine/src/renderer')

diff --git a/engine/src/renderer/opengl.rs b/engine/src/renderer/opengl.rs
index 7220ddc..f48dcc0 100644
--- a/engine/src/renderer/opengl.rs
+++ b/engine/src/renderer/opengl.rs
@@ -61,7 +61,7 @@ use crate::opengl::{
     Capability,
     ContextFlags,
 };
-use crate::projection::{new_perspective_matrix, Projection};
+use crate::projection::{ClipVolume, Projection};
 use crate::texture::{Id as TextureId, Texture};
 use crate::transform::{Position, Scale};
 use crate::util::NeverDrop;
@@ -469,19 +469,20 @@ fn apply_transformation_matrices(
     gl_shader_program
         .set_uniform_matrix_4fv(c"model", &create_transformation_matrix(transformation));
 
-    let view = create_view(camera, camera_pos);
+    let view_matrix = create_view_matrix(camera, &camera_pos.position);
 
-    gl_shader_program.set_uniform_matrix_4fv(c"view", &view);
+    gl_shader_program.set_uniform_matrix_4fv(c"view", &view_matrix);
 
     #[allow(clippy::cast_precision_loss)]
-    let projection = match &camera.projection {
-        Projection::Perspective(perspective) => new_perspective_matrix(
-            perspective,
-            window_size.width as f32 / window_size.height as f32,
-        ),
+    let proj_matrix = match &camera.projection {
+        Projection::Perspective(perspective_proj) => perspective_proj
+            .to_matrix(window_size.width as f32 / window_size.height as f32),
+        Projection::Orthographic(orthographic_proj) => {
+            orthographic_proj.to_matrix_rh(&camera_pos.position, ClipVolume::NegOneToOne)
+        }
     };
 
-    gl_shader_program.set_uniform_matrix_4fv(c"projection", &projection);
+    gl_shader_program.set_uniform_matrix_4fv(c"projection", &proj_matrix);
 }
 
 fn apply_light<PointLightHolder>(
@@ -694,11 +695,11 @@ fn create_light_uniform_name(
     }
 }
 
-fn create_view(camera: &Camera, camera_pos: &Position) -> Matrix<f32, 4, 4>
+fn create_view_matrix(camera: &Camera, camera_pos: &Vec3<f32>) -> Matrix<f32, 4, 4>
 {
     let mut view = Matrix::new();
 
-    view.look_at(&camera_pos.position, &camera.target, &camera.global_up);
+    view.look_at(&camera_pos, &camera.target, &camera.global_up);
 
     view
 }
-- 
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